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I have the service manual and it has a lot of symptoms for your problem can you tell me exactly what happens when you first start the TV but it sounds like a scan converter problem This is what I got from the service manual page 4

4-2. Self Diagnosis Function

4-2-2. Criteria for Judgment of Abnormality

11. Detection of abnormality in communication with scanconverter.(Name of this function on the service menu : OTHERS)Warning when communication with scan convertercannot be performed normally

or this could be it

14. Detection of PDP failure.(Name of this function on the service menu : Nil)PDP is suspected to be defective when DIGITAL 5 Vis normal among the voltages (VS, VA, DIGITAL 5V) required to drive PDP while both VS and VA arenot inputted.When all the following conditions are satisfied, themachine enters once to the STANDBY mode then turnthe main power back on again.

This is a monitor, not a TV. You need a VGA, SVideo or composite connection for video. There are S-video modulators to convert your RCA signal to S-video. About $30 at Radio Shack or Best Buy.The audio is pass through only. You must have external speakers with an outside power source. If you don't have an amplifier for outside audio you can use a cheap set of computer speakers.

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These flashes are fault indications, and are blinking codes. From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside the TV. If you wish to get more details about these blinking codes to plasma TVs, check this link It has detailed description. http://electronicshelponline.blogspot.com/
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Keep in mind that your Sony IS NOT A TV, but a monitor instead. There is an actual XBOX360 VGA adapter that's available at most gaming retailers. It was initially designed for those who wanted to use their PC monitors for there console gaming. HDMI is NOT compatible with a VGA input as HDMI is a digital signal type and VGA is an analog type connection. You must also remember to have the XBOX set to a NON-progressive resolution (480i) if trying to hook it up using the standard XBOX video cables.

It is unusual for fans to become noisy buy with the power off you can check to see if it the fan has something trapped in it - in which case remove it. Also check to see if there is any blade damage. Check to make sure it is securely fastened and if not tighten the screws / bolts that secure it. Spin the blades with your finger to see if it makes any noise, wobbles or is difficult to move. If so then it may need replacing. Make sure the blades do not protrude out of the casing - if so push down on the centre of the blade to see if it will go back into position. The power to the fan may be unregulated so the fan may change speed and effectively pulse and therefore change pitch – check the supply voltage and ripple content. Other than that the fan may just need replacing.

I have the service manual and it has a lot of symptoms for your problem can you tell me exactly what happens when you first start the TV but it sounds like a scan converter problem This is what I got from the service manual page 4

4-2. Self Diagnosis Function

4-2-2. Criteria for Judgment of Abnormality

11. Detection of abnormality in communication with scanconverter.(Name of this function on the service menu : OTHERS)Warning when communication with scan convertercannot be performed normally

or this could be it

14. Detection of PDP failure.(Name of this function on the service menu : Nil)PDP is suspected to be defective when DIGITAL 5 Vis normal among the voltages (VS, VA, DIGITAL 5V) required to drive PDP while both VS and VA arenot inputted.When all the following conditions are satisfied, themachine enters once to the STANDBY mode then turnthe main power back on again.